A productive ditch in Central Mississippi

A lot of the ditches in the Jackson, Mississippi area have lost the variety of aquarium plants they used to have because they have been taken over by either a Polygonum species or Alternanthera philoxeroides Alligator weed. We have had several years with below normal rainfall which may have contributed to the loss of other species, or the species that used to be there (Ludwigia, Micranthemum etc.) are pioneer species that get replaced in a process of succession. So, I was glad to run across a new ditch that was created about a year and a half ago that has already acquired an interesting variety of plants. It was created when a bicycle path was put in last fall and the path blocked water flow from a woods creating standing water about 6 inches deep along the path. Ludwigia palustris showed up early this spring and grew with astonishing rapidity. At first I thought that Ludwigia was the only plant, but closer examination showed a number of other species. had also made it there in only one season. I found Ludwigia glandulosa, Bacopa routundifolia, Lindernia dubia, an Ammannia species, Ditch stonecrop (Penthorum sedoides), a possible Mimulus species and some Polygonium. Photos, below show all but the Polygonum.

This photo shows the extensive growth of Ludwigia repens. There is a Ludwigia glandulosa plant in the lower right corner that I did not recognize when I took the picture.